sky marshal

1. (客机上的)空中警官，空警
   A sky marshal is an armed security guard who travels on passenger flights.

1. The sky Marshal launches operation March to victory.
   太空元帅启动了胜利三月行动。

noun

1. a person trained by the government in hijacking and terrorist tactics who (for security reasons) is a passenger aboard an airline flight

   Synonym:    air marshal